Do you have a NAND backup? If yes, you can fix it with a hardmod.
If not, you're probably screwed. There's still a chance it can be fixed with the known-plaintext attack and a hardmod to rewrite the FIRM partition back to normal. While theoretically that's doable I'm not aware of anyone that's actually done it for a case such as this.

Do you have a NAND backup? If yes, you can fix it with a hardmod.
If not, you're probably screwed. There's still a chance it can be fixed with the known-plaintext attack and a hardmod to rewrite the FIRM partition back to normal. While theoretically that's doable I'm not aware of anyone that's actually done it for a case such as this.

Did you take a backup of your console's NAND when you followed this clearly shitty guide in god knows where? Because if you didn't and you directly downgraded to 2.1 then you are bricked for good .. Time to get a new console and read the instructions better next time. (And use a better guide..)